Thanks to Kevin Klawitter for passing along this concept art from AICN, featuring Chris Evans as Captain America, WWII era super-patriot and all-around fine upstanding citizen. Wiki says:
Captain America has no superhuman powers, although as a result of the Super-Soldier Serum and “Vita-Ray” treatment, he is transformed from a frail young man into a “perfect” specimen of human development and conditioning. Captain America’s strength, endurance, agility, speed, reflexes, durability and healing are at the highest limits of natural human potential.
Vita-Ray Super-Soldier Serum — Accept No Substitutes!